Design on Push Structure of Centrifugal Cone Seed-metering Device and Its Filling Mechanism Analysis

Abstract

Aiming at the bottleneck problem that hinders the high-speed work development of mechanical seed-metering device, a kind of centrifugal cone direction push way for grain filling was proposed, the influence of the grain in the internal cavity filling properties of stress types and mechanical laws was analyzed, the composite filling stress mathematical model was established, the effective way to improve the filling force was found out through theoretical analysis, and the mathematical model was gradually dressed with the help of Matlab and ORIRIN drawing software to determine the optimal key structure parameters. Through the single bench test using discrete element simulation software EDEM virtual simulation of centrifugal push structure, and the cavity structure of centrifugal cone disc metering device were tested, the superiority of additional centrifugal push structure was demonstrated, test results showed that in the 7~13km/h high speed operation, the average leakage sowing index of Indus cavity structure cone disc metering device was reduced by 2.52%, at the same time, the postprocessing function measured marker granule filling variation and numerical prediction value basically had the same trend, which verified the feasibility of the theoretical model, maximized the play of a layer of centrifugal force on the pre filling grain, and to further expand the effective filling area, the study provided theoretical basis and reference for the centrifugal cone type high speed exhaust device design and development.

Keywords: mechanical seed metering device, centrifugal push structure, high speed work, mechanism analysis, contrast experiment